Driving and stopping mechanism.



L. E. TOPHAMW DRIVING AND STOPPING MECHANISM.

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Patented June 9,1914.

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L. E. TOPHAM. nnivme AND STOPPING mnoaamsm APPLICATION FILED AUG. 12,1912.

Patented June 9, 19%

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L. E. TOPHAM" DRIVING AND STOPPING mnommsm.

APPLIOATIOH FILED AUG. 12, 1912.

1,099,328. Patented June 9,1914

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Ifwwssas': fiwvenion- L. B. TOPHAM.

DRIVING AND STOPPING MECHANISM.

APPLICATION rmsn (1.12, 1012.

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ii El li fitventon:

L. E. TOPHAM.

DRIVING AND STOPPING MEGHANISM.

APPLICATION FILED AUG. 12, 1912.

Patented June 9, 1914 6 HEIGHTS-SHEET 5.

UNITED sTATEs PATENT OFFICE.

LAURENCE E. TOPHAM, OF SWAMPSGOTT, MASSACHUSETTS, ASSIGNOR TO UNITEDSHOE MACHINERY COMPANY, OF PATEBSON, NEW JERSEY, A CORPORATION OF NEWJERSEY.

DRIVING AND STOPPING MECHANISM.

Specification of Letters Patent.

Patented June 9, 1914.

Application filed August 12, 1912. Serial No. 714,623.

HAM, a citizen of the United States, residing at Swam scott, in. thecounty of Essex and State 0 Massachusetts, have invented certain new anduseful Improvements 111 Driving and Stoppin Mechanism; and I do herebydeclare the allowing to be a full, clear, and exact description of theinventlon, such as will enable others skilled in the art to which itappertains to make and use the same.

The invention relates to driving and stopping mechanism adapted for usein hlgh speed machines. a

The object of the invention is to provide novel and improved mechanismby which a machine or mechanism which is normally driven at a high speedmay be stopped in a certain and reliable mannerat a predetermined pointin its cycle of operations without undue shock and wear upon the parts.

With this object in view the invention contemplates the provision of amechanism for driving a machine or mechanism at a high speed during itsnormal operation, and a slow speed driving mechanism which 1s throwninto operation just before the machine is to be stopped, and which firstacts as a brake to slow down the machine, and then acts to drive themachine at a predetermined slow speed to stopping position. In thepreferred form of the invention the slow speed driving mechanismcomprises a friction brake which is engaged at a predetermined time inthe cycle of operations of the driven machine to slow down the machineand then drive it at a uniform slow speed, and which is disengaged whenthe machine is brought to stopping position. The driving, member of theslow speed clutch may be driven in either a forward or reversedirection, and in either case acts as a friction brake to graduallyreduce the speed of the driven parts until the slip between the membersceases, after which it either continues the forward motion of themachine or turns it back 'at a uniform reduced speed to stoppingposition. The

means for throwing the slow speed. clutch into operation is preferablyautomatic in its action, and is under the control of the operatorthrough mechanism by which he may at will throw the high speed mechanismout of action and render the mechanism for throwing in the slow speedclutch active.

The invention also includes certain further features of construction andcombinations of parts which are hereinafter described and set forth inthe claims.

The invention will be readily understood from an inspection of theaccompanying drawings and the following detalled description of theconstruction illustrated therein.

In the drawings, Figure 1 is an elevation showing a side view of amachine embodying the invention in its preferred form; Fig. 2 is asimilar view of the head of the machine with the parts in the positionwhich they occupy after the machine is brought to rest; Fig-3 is avertical sectional elevation through the axis of the cam shaft of themachine, the parts being'in the same position indicated in Fig. 2; Fig.4 is a horizontal view partly in section with the parts in the sameposition; Fig. 5 is a sectional elevation on line 5--5 of Fig. 4,1ookingtoward the left; Fig. 6 is a sectional elevation on line 6--6 of Fig. 4,looking toward the right; and Fig. 7 is a detailed rear view lookingtoward the right in Fifi. 6.

In the drawings the invention is i ustrated as embodie in a welt andturn sewing machine such as shown and described in the application ofAndrew Eppler, Serial No. 44 ,542, filed August 8, 1908, and the slowspeed driving mechanism and the mechanism for cont-rolling its operationare constructed and arranged to reverse the cam shaft in stopping themachine, so that the needle is retracted while its hook is empty and isbrought to rest in position where it does not interfere with the removalof the shoe. It will be understood, however, that the mechanismillustrated, as well as the invention embodied therein, is not confinedin its application to a machine of this character, but ma be used inother machines and in other re ations.

The machine shown is provided with the usual stitch forming and workuiding and feeding devices, which are not shown in the drawings, andthese devices are operated through suitable connections by cams carriedby the cam shaft 6 of the machine. As

is usual in this type of machine, the cam shaft makes one revolution foreach cycle of operations performed by the stitch forming and workfeeding devices. I

- Durin the operation of the machine it is driven t rough a belt pulley7 secured to the end of the cam shaft, and connected by a driving belt 8with a pulley .9 mounted in the base of the machine- The pulley 9 isconnected through bevel gears 10 with a sleeve 11 mounted on the drivingshaft 12 and carrying one member 13 of the main driving. clutch. Thedriving. shaft carries the other member 14 of the clutch, and alsocarries. the driving pulley 15 through which motion is imparted to thedriving shaft.

- The engagement of the members of the driving clutch is controlledthrough a treadle 16 connected with' the clutch operating wedge- 17.When the treadle is depressed, the members of the driving clutch areforced intoengagement, and the machine is driven at a speed dependingupon the pressure which the operator applies to the treadle. When thetreadle is released the clutch members are disengaged, thus disconnectinthe cam shaft of the machine from the driving shaft; The upward movementof the treadle when it is released also throws into operation the slowspeed driving and stopping mechanism. This mechanism, in theconstruction shown, comprises a reversely driven friction clutchconsisting. of the clutch members 18 and 18".

clutch 18 is formed ona flange 24 project-.

ing from a sleeve 25 which is loosely mount- .ed upon the cam shaft 6.The sleeve 25 is free to slide. longitudinally on the shaft,

but is connected to rotate with the shaft bymeans of a block 26-sec'uredto the pulley 7 and arranged between lugs 27 projecting radially fromthe sleeve 25. The sleeve is held normally in position with the clutchmembers out of engagement by a sprin 28 arranged in a recess in theblock 26 an interposed between the bottom of the recess and the head ofabolt which carries a plate 29 engaging the lugs 27. The normal positionof the clutch sleeve is determined by an. adjustable stop screw 30 whichmay be adjusted to maintain the clutch sleeve in properrelation to theclutch member. 'When 5 the clutoh."fni embers 18' and 18' are engaged,

they actasj'agfrictional brake to absorb the. energy due to the'momentum of the carn- The clutch'member 18 is formed on a spiral gear 19which is loosely mounted shaft, and after the forward movement of theshaft has ceased the clutch'acts to turn the cam shaft in a reversedirection at a comparatively slow "speed until the clutch is disengaged,when the cam shaft'is brought the stitch forming mechanism in the properposition for the removal of the shoe.

The mechanism for engaging and disengaging .the clutch at the propertimes in the rotation of the cam shaft comprises a cam groove 31 formedin the sleeve 25 and engaged by a roll on one arm of a bell crank lever32. The other end of the bell crank lever is provided with a hole 33adapted to receive a coupling device in the form of a pin'34 which isnormally held out of .en-

to rest with the needle and other parts of gagement with the lever, sothat during the normal'running of the machine the lever is oscillatedidly by .the cam. The pin. is-

mounted in the end of aslide 35'which is held in normal position by aspring 36. The

spring surrounds a bolt 37 extending from the rear end of-the slide, andis interposed between a shoulder on the slide and the inner.- end of .anadjustable screw threaded sleeve 38. The bolt 37 carries a nut 39 whichengagesthe outer end of the sleeve and holds the spring under tension.By adjusting the nut the tension of the spring may be varied, and byadjusting. the sleeve 38 the slide may be adjusted to bring the couplingpin into proper register with the hole in the end of the lever 32. Thepin is forced in a direction to engage it with the bell crank lever by aspring 40, and the lower end of the pin is connected with the treadle 16so that the pinis held down outof engagement with the bell crank leverso long as the treadle is depressed and the main driving clutch isacting to drive the cam shaft of the machine. A latch 41 is alsoconnected with the lower .end of the coupling pin, and is arranged toengage a shoulder 42 on the'slide 35, and hold the pin in its lower 1position until the treadle has been-raised sufliciently toallow the pinto engage the bell crank lever. In the construction shown, the latch 41is loosely pivoted on a rock shaft 43, and is connected with the shaftby a pin 44 projecting through a slotin the hub of the latch (Figs. 4and5) The rock shaft- I ment of thetreadle the coupling pin isdrawn downagainst the tension of its spring. This carries the latch 41 under theshoulder 42. When the treadle is released the latch 41 prevents theupward movement of the pin, and the rock shaft 43 is. rocked until thepin 44 strikes the end of the slot in the hub of the latch and swingsthe latch outward, th'us disengaging it from the shoulder 42. When thistakes place the spring forces the pin upward against the under side ofthe bell crank lever, and when the hole in the lever registers with thepin the pin snaps u into the hole, thus connecting the lever with theslide 35. The cam 31 is so timed that the hole in the end of the bellcrank lever is brought into position to register with 'tliecoupling pinat the proper time in the cycle of operations of the stitch formingmechanism. When the pin is en gaged with the bell crank lever the leveris held from movement about its pivot, and the cam 31 acting on the rollcarried by the lever, shifts the clutch sleeve 25 to bring the membersof the reversing clutch into engagement; When the lever and slide 35 areconnected by the coupling pin, the movement of the lever is resisted bythe spring 36, and the force with which the members of the frictionclutch are pressed together will dependupon the tension of the spring.This may be adjusted to secure the desired braking effect between themembers of the friction clutch so that the forward rotation of the camshaftwill be arrested without undue shock or jar and within the desiredpart of a revolution. In the construction shown, the parts are so timedand controlled that the coupling pin is engaged with the lever and thefriction clutch engaged while the needle is retracted, and just beforeit begins its advance movement, and the forward rotation of the camshaft is arrested after the needle has advanced and entered the work.The clutch then acts to turn the cam shaft in a reverse direction at aslow speed until the shaft arrives atthe point where the cam 31 actedto'engage themembers of the clutch, when the revers'ely moving cam actsto again disengage the clutch members. a The cam shaft is thereforebrought to the desired stopping position after the momentum of themachine has been gradually overcome by the slip between the members ofthe clutch at a predetermined slow speed which is unafiected by thespeed of the machine at the time the main driving clutch is disengaged.When the reversing clutch is disengaged, the reverse movement of thecam.

shaft maybe finally stopped by a friction brake applied to'one of thecam disks on the shaft, or by a positive stop, or both means may beemployed, in which case thepositive sto acts asa safety device toprevent any accidental overrunning of the camshaft. In the constructionshown, both devices are employed. As shown, the stop comprises a stoparm 48 secured to a rock shaft49 and having its end arranged to be movedinto and out of the path-ref a stop shoulder50 ona cam disk 51 whichis-secured to the cam Ishaft;

in the forward rotation of the cam shaft.

With the lever in this position, the stop 48 is out of the path of theshoulder 50. When the rotation of the cam shaft is reversed, a notch inthe sleeve acts on the lever 53 and rocks it into the position indicatedin Fig. 6, thus rocking the shaft 49 to throw off the thread tension,and also to bring the stop arm. 48 into the path of the shoulder 50.

As shown, the friction brake which is applied when the slow speed clutchis disengaged comprises a brake strap 54 arranged to partially surrounda disk 55 on the cam shaft. The front end of the brake strap is securedto a fixed stud 56, and the rear end is connected to the upper end ofthe arm 52 so that the brake is applied when the shaft 49 is rocked atthe completion of the reverse movement of the cam shaft. In order thatthe brake may be relieved before the machine is started, means areprovided for re lieving the tension on the brake strap which areoperated by the depression of thetreadle. In the construction shown therear end of the brake strap surrounds an eccentric drum 57 formed on theend of a rock shaft 58 which is journaled in the end of the arm 52. Theother end of the rock shaft carries an arm 59 which is slotted toreceive a pin 60 projecting from the stud 61 which'forms the pivotaiconnection between the link 47 and the arm 46. When the treadle isdepressed to start the machine, the link 47 is drawn downward in themanner already described, and the pin 60 acting in the slot of the arm59 rocks the shaft 58 to relieve the pressure of the brake band upon thedisk 55.

The brake therefore offers no resistance to the rotationof the machinewhen the main;

drivin clutch is engaged.

Whi e in the construction described the driving member of the slow speedclutch is driven in a reverse direction so that the cam shaft of themachine is reversed in stopping the machine, substantially the samemechanism may be employed for bringing the camor driving shaft of asewing or other machine into stopping position without reversing theshaft. In such case the driving member of the slow speed driving clutchwill be driven in a forward direction, as, for instance, by connectingthe pulleys 7 and 9 by ano'pen nstead of a cross belt. In this casethe-clutchmembers when engaged will act as? a friction brake to absorbthe energy due at a predeterminedpoint in the'rotation of the cam shaft,and at a point suiiiciently in advance'of the "point where the shaft isto be'stopped, to insure a proper braking interval and gradual slowing,down of the shaft'bcfore it is brought into stopping position. Theproper braking and slowing down of the shaft without undue shock orjaris therefore insured, and the shaft is uniformly driven at the speedof the slow speed clutch into stopping position regardless of the speedof the machine at the time that the main driving clutch is disengaged.

Havlng explained the nature and object of the invention, andspecifically described one form of mechanism in which it may b embodied,what is claimed is 1. A driving and stopping mechanism, having,in'comhination, a shaft, hi h and low speed driving mechanisms there or,means under the control of the operator for shifting to the low speeddriving mechanism at a certain predetermined time in the rotation of theshaft, and means for stopping the shaft-While it is beingdriven bythe,low'

speed mechanism.

2. A driving and stopping mechanism, having, in combination, a shaft,high and low speed driving mechanism therefor,

means vunder the control of the operator operating automatically toshift to the low speed driving mechanism at a certain predetermined timein the rotation of the shaft, and means for stopping the shaft While itis beingdriven by the low speed mechanism.

3. A driving and stopping mechanism, having, in combination, a maindriving mechanism and reverse low speed driving mechanism constructed tofirst act as a" fric tion brake to gradually arrest the forward movementof the driven parts, and to then drive them at a slow speed back tostopping speed driving mechanism having provision;

position.

4. A driving and stopping mechanism, having, in combination, a shaft,=ahigh speed driving mechanism therefor under the con- 'trol of theoperator, a low speed friction clutch, and means acting automaticallywhen the high speed mechanism isthroWn out by the operator to engage theclutch at a predetermined point in the rotation of the shaft and todisengage the clutch when the shaft is brought to stopping position.

5. A driving and stopping mechanism, having, in combinatioma shaft, ahigh speed driving mechanism therefor, a low speed reversing frictionclutch, and means for engaging the clutch at a predetermined (point inthe rotation ofthe shaft and for sengaging the clutch when the shaft isbrought to stopping position.

6. A driving and stopping mechanism,

having, in combination, a shaft, main driving mechanism therefor, lowspeed driving mechanism havingprovision for frictionall resisting theforward movement of the sha when thrown into operation, means under thecontrol of the operator for throwing the slow speed drivingmechanisminto opera-V tion at a predetermined point in the rotation ofthe shaft, and means for throwing the low speed driving mechanism out ofoperation and stopping the shaftat a predetermined point.

-7. A -driving and "stoppingrmechanism, having, in combination, a shaft,a main driva driving mechanism therefor, braking and,

low speed driving vmechanism, means for throwing the braking and lowspeeddriving mechanism into and out of operation including a timing cam,a lever normally engaging the cam, and means for rendering said cam andlever active when the main driving mechanism is thrown out of operation.

9. A driving and stopping mechanism, having, in combination, ashaft,.high' speed driving mechanism therefor, a braking and reversedriving mechanism, means for throwing said brakingand reverse drivingmechanism into and out of operation including a timing cam, and meansfor rendering said cam active when the'main driving mechs anism isthrown'out of operation. Y

i 10. A driving and stoppingmechanism having, .in combination, a shaft,.a high speed driving mechanism therefor, av low for frictionallyresisting the forward movement of the shaft. when thrown into operastion, means for throwing said low speed driving mechanisn into and outof L ation including a timing-cam and a normallyinactive actuatinglever'normally engaging the cam, and means for rendering sai l leverand.

cam active vshen the high, speed driving mechanism is thrown out.

1]. A driving and stoping mechanism,

having, in combination, a haft, a high speed driving mechanism therefor,a reversely' driven. low speed friction clutch, devices driven from theshaft for engaging'and disengaging the clutch, and means for renderingsaid latter devices active when the high speed driving mechanism isthrown out.

12. A driving and stopping mechanism, having, in combination, a shaft,driving mechanism therefor including a starting and stopping treadle, alow speed clutch comprising a friction clutch member connected to rotatewith the shaft, a cam driven by the shaft, an actuating lever operatedby the cam, and a coupling device operated by the treadle for renderlngthe lever and cam active to engage the low speed clutch when the'treadle is actuated to stop the shaft.

13. A driving and stopping mechanism, having, in combination, a shaft, atreadle controlled driving mechanism therefor, a low speed frictionclutch one member of which is connected to rotate with the shaft, a camon the clutch member, an actuating lever operated by the cam, a springslide, and a coupling pin 0 erated by the treadle for connecting the slie and lever when the treadle is actuated to throw out the drivingmechanism.

14. A driving and stoppin mechanism, having, in combination, 'a sha t,main driving mechanism therefor, a low speed friction clutch membermounted on the shaft, a cooperating clutch member connected to rotatewith the shaft, a cam connected with the shaft, and devices renderedactive upon the throwing out of the driving mechanism for cooperatingwith the cam in engaging and disengaging the clutch members.

15. A drivin and stopping mechanism, having, in com ination, a shaft, atreadle controlled driving mechanism therefor, a low speed frictionclutch member mounted on the shaft, a cooperating friction clutch memberconnected to rotate withthe shaft, a cam on the latter clutch member, alever operated by the cam, a spring slide, and a coupling deviceoperated by the treadle for connecting the lever and slide.

16. A driving and stopping mechanism, having, in combination, a shaft, atreadle controlled driving mechanism therefor, a low speed frictionclutch one member of which is connected to rotate with the shaft, meansfor engaging and disengaging the clutch includin a timin cam driven fromthe shaft, a friction bra e, means for applying the brake when thefriction clutch is disengaged, and means operated by the treadle forreleasing the brake in starting the driving mechanism.

17. A driving and stopping mechanism, having. in combination, a shaft, atreadle controlled driving mechanism therefor, a low speed frictionclutch, mechanism for engaging and disengaging the clutch comprising acam driven by the shaft, a lever operated by the cam, and a coupling pinfor engaging the lever, and devices connecting the coupling pin with thetreadle comprising a latch for preventing the engagement of the pin withthe lever during the initial movement of the treadle.

LAURENCE E. TOPHAM.

Witnesses:

CHESTER E. Rooms, MABEL A. SIVE'IT.

